Study the Effect of Ruthenium Dye Layer on Negative Capacitance in Solar Cells Based on the Nc-TiO2 Semiconducting Polymer Heterojunction


We report the effect of ruthenium dye on negative capacitance of nanocrystalline titanium dioxide/poly(3-hexyl thiophene), nc-TiO2/P3HT, heterojunction solar cells. It has been found that the low frequency capacitance reaches a high positive value and then drop to the negative region. In P3HT/Ru-Dye/nc-TiO2 solar cells, the negative capacitance is observed under very low forward bias condition unlike the negative capacitance in P3HT/ncTiO2 solar cells. That is attributed to the difference of the concentration of dipole and presence of depletion region at interface between the P3HT and nc-TiO2.

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Al-Dmour, H. (2015) Study the Effect of Ruthenium Dye Layer on Negative Capacitance in Solar Cells Based on the Nc-TiO2 Semiconducting Polymer Heterojunction. Materials Sciences and Applications, 6, 95-102. doi: 10.4236/msa.2015.61012.

Conflicts of Interest

The authors declare no conflicts of interest.


[1] Tina, A., Zhang, J., Wang, X., Yu, T. and Zou, Z. (2011) Influence of Capacitance Characteristic on I-V Measurement of Dye-Sensitized Solar Cells. Measurements, 44, 1551-1555.
[2] Demet, K., Abdulmecit, T. and Semsettin, A. (2013) The Origin of Negative Capacitance in Au/n-GaAs Schottky Barrier Diodes (SBDs) Prepared by Photolithography Technique in the Wide Frequency Range. Currrent Applied Physics, 13, 1101-1108.
[3] Bao, X.C., Xu, J.T., Li, C., Zhang, Y. and Li, X.Y. (2013) Temperature and Frequency Dependence of Negative Differential Capacitance in a Planar GaN-Based p-i-n Photodetector. Journal of Alloys and Compound, 581, 289-292.
[4] Zhu, C., Feng, L., Cong, H., Zhang, G. and Chen, Z. (2009) Negative Capacitance in Light-Emitting Devices. Solid State Electronics, 53, 324-328.
[5] Lungenschmied, C., Ehrenfreund, E. and Sariciftic, N.S. (2009) Negative Capacitance and Its Photo-Inhibition in Organic Bulk Heterojunction Devices. Organic Electronic, 10, 115-118.
[6] Al-Dmour, H. (2014) Effect of Ambient Air Condition on Low Frequency Negative Capacitance of nc-TiO2/P3HT Heterojuction Solar Cells. American Journal of Applied Science, 11, 351-1356.
[7] Taylor, D.M. and Gmoes, H.L. (1995) Electrical Characterization of the Rectifying Contact between Aluminium and Electrodeposited Poly(3-methylthiophene). Journal of Physics D: Applied Physics, 28, 2554-2560.
[8] von Hippel, A.R. (1954) Dielectrics and Waves. Wiley, Hoboken.
[9] Wnag, C.C., Liu, G.Z. and Lu, H.B. (2008) Low-Frequency Negative Capacitance in La0.8Sr0.2MnO3/Nb-Doped SrTiO3 Heterojunction. Applied Physics Letter, 92, 052905-052908.
[10] Lucia, M.L., Hernandez, R., Leon, C. and Martil, I. (1993) Capaictance Measurements of p-n Junition: Depletion Layer and Diffusions Capacitance Contribution. European Journal of Physics, 14, 85-89.
[11] Westermark, K., Henningsson, A., Rensmo, H., Soodergren, S., Siegbah, H. and Hagfeldt, A. (2002) Determination of the Electronic Density of States at a Nanostructured TiO2/Ru-dye/Electrolyte Interface by Means of Photoelectron Spectroscopy. Chemical Physics, 285, 157-165.

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